Furnace.



G. NORDELL.

FURNACE.

APPLIGATION IILED MAYIZ, 1909.

966,233, PatentedkAugfi, 1910.

TCA'RL NOR/DELL, OF STAMFORD, CGNNEQTICUT.

FURNACE.

To all whom 'it may concern:

Be it known that I, CARL NORDELL, of Stamford, Fairfield county, Connecticut, have invented a new and useful Improvement in Furnaces, of which the following is a full, clear, and exact description.

My invention relates to improvements in furnaces of various kinds and more especially to coal burning furnaces, and particularly to the grate construction of such furnaces. Much of the waste occurring in coal combustion, and most of the smoke, 1s caused by. the fact that there is imperfect combustion in the furnace. This isoccasionedby the fact that there is improper admixture of gasesin the furnace.

The object'of my invention is to provide a simple means of getting this correct admixture of gases so that practically perfect combustion' will result. I accomplish this result preferably-by the use of a special form of grate-bar in connection with regulable air inlets above and below the grate, butgenerally by providing means, for admitting air beneath thegrate, discharging super-heated.

air into the fire-box above the grate, and having a regulable air inlet and a peep hole through the furnace door, so that hot air can,

be discharged into the fire box, andby observing the condition of the fiamesthrough the door and regulating the draft above and below the grate, just the proper effect can be obtained. In carrying out the above ideas, I prefer to have the air inlet through a hollow grate bar and through an air distributer which projects upward from the grate-bar to a point above the normal coal bed, so that the air will be in this Way super-heated, and the construction will be simple. I also prefer to provide a detachable air distributer for the grate bar, as this part is likely to be burned out first, and by making it detachable, a new one can be easily substituted.

Reference is tobe had to the accompanying drawings forming a part of. this specification, in which similar reference characters indicate corresponding parts ii all the views. Figure l is a-sectional elevation of a furnace provided withmy improved grate-bar. Fig. 2 is a sectional plan on the line, 22 of Fig. 1 of the grate-bar.

The grate bar. 10 can beof any usual design, and I have shown the customary grate with its lateral arms, and with its .ends resting on the furnace wall 11 and on the bridge Specification'of Letters mm.

Application filed May 12, 1909. Serial'No. 495,510.

Patented Aug. 2, 1910.

abovethe normal coal bed, where it has outlets 15, the air distributer being preferably closed at the top so thatthe heated air will issue, mingle with the gases of the furnace, and the combustible material to be con-.

'sumed. As this air distributer is likely to be burned out before the body of :the grate bar, I prefer to make it detachable, and to this end it has on the front lower edge, a hook or lug 16 adapted to enter the opening in the grate-bar and hook beneath the top surface of the grate-bar, while onthe opposite lower edge is :1 lug 17 adapted to rest in a slot 18 in the grate-bar, in which the lug may be fastened by a transverse bolt 19, or

by any equivalent fastening.

The furnace has the usual ash-pit door 20, and this door is provided with a common form of draft regulating slide 21. The tirebox. has also the customary door 22 which has a sight hole closed by mica 23 and a draft regulating slide 24. It will be seen that the air entering the ash-pit will pass up through the grate-bar and throu h the air distributerll and be mingled wit the coal gases so as to promote combustion, and the fireman can look through the mica 23 and see just the actual appearance of the fire, and by manipulating the slides 21 and 24, can provide for the correct admixture of gases. This'is more important than would at first sight appear, because if it is necessary to open the door 22 to see how the fire looks, the great inrush of air has such an effect that the fireman really does not know the normal condition of the fire-box.

My invention is not limited to the particu-' 'lar furnace, grates and boilers shown, and

obviously the idea can be a plied to grates of many varieties without a ecting the princ ple of the invention. Where, however, the air distributer 14 is used, it is better to have the air distributer flattened and with the long- ,est. diameterarranged parallel with the draft or smoke exit so that as little obstruction as possible will be offered to the furnace draft.

Having thus fully described my invention, I claim as new and desire to secure by and loweredge, and an outlet near therear part thereof; said bzir having a slot in its upper surface near said rear outlet, and adetachable air distributer adapted to form a continuation of said rear outlet, said air distributer having lugs upon its lower edge, one of said lugs being adapted to book. be-

neathv lt opisuz face bai and the- 

